Sargassum	
distribution	and	
abundance	reveal	a	
World	Heritage		Paulo	Horta	
Professor	
Universidade	Federal	de	Santa	Catarina	
24/10/2019
Sargassum	is	the	main	builder	of	
Southern	Atlantic	Marine	Forests		
•  Threats	–	Pollution	and	overfishing
Hypothesis	
Brazilian	golden	tide	event
2014	-	25	tons	
2015	-	150	tons
Sargassum	bloom:	is	it	a	problem	
or	opportunity?
Niche	suitability
Sargassum	relative	potential	
importance	
10,000	
400	
80
Currents	
Iron	on	the	surface
Likely	scenario	
•  Global	stressors	
–  Ocean	warming	
–  Ocean	acidification	
•  Local	stressors	
–  Trophic	changes	
–  Continental	runoff	
•  Agriculture	
•  Deforestation	
•  Dam	
•  Mining
Sargassum		bloom:	it	is	a	
problematic	opportunity!	
•  Goods	
–  Agriculture	
–  Biotechnology	
•  Services	
–  Raft,	biological	connection	
–  Carbon	sink	
Sargassum	goods	and	services	should	provide	
tools	to	solve	regional	negative	socio-
environmental-economic	consequences
Applied		
initiatives	
“Bio	fertilizer”	-	Arabidopsis	thaliana		
	
25o	control	
Root	abundance	
If	we	have	more	roots	we	should	reduce	runoff,	soil	erosion,	and	
ocean	fertilization
Land	use	evolution	
Deforestation	
Agriculture	
Dam
Mining	
Deforestation	
Agriculture	
Dam	
Management	omissions	
have	high	socio-economic	and	
environmental	costs
Solutions	in	different	scales	
Mining	
Agriculture	
Dam
Link	Science	and	Management	
Mining	
Agriculture	
Dam
Now…The problem	
	
		
Brazil	
Caribbean	
Runoff	+	OW+	OA	
Golden	tide
New	transnational	program	
	
		
Nature-based	solutions	
Brazil	
Caribbean	
Runoff	+	OW+	OA	
Golden	tide	Management	
Biotechnology	
-New	generation		
Fertilizers	
-	Mining		
bio-remediation
New	transnational	program	
	
		
Nature-based	solutions	
Brazil	
Caribbean	
Runoff	+	OW+	OA	
Golden	tide	Management	
Biotechnology	
-New	generation		
Fertilizers	
-	Mining		
bio-remediation
Thank	you	
email:	pauloantuneshorta@gmail.com	
Lidiane	Gouvea	
lidi_pel@hotmail.com	
Marina	Sissini	
msissini@gmail.com	
Brazilian	workgroup	
	
Marina	Sissini	(UFSC)		
Lidiane	Gouveia	(UFSC)			
Giulia	Burle	(UFSC)		
Gabrielle	Koerech	
(UFSC)			
Leila	Hayashi	(UFSC)	
Mariana	Cabral	de	
Oliveira	(USP)			
Inara	Regina	(USP)		
Fanly	Fungyi	Chow	Ho	
(USP)	
Cícero	Alves-	Lima	(USP)		
Pio	Colepicolo	(USP)		
José	Eduardo	Martinelli-
Filho	(UFPA)			
José	Marcos	de	Castro	
Nunes	(UFBA)			
Maria	Teresa	Menezes	
Szechy	(UFRJ)	
Thayná	Mello	(ICMBio)		
Fernanda	Arentz	
(MARINHA)		
Paulo	Horta	(UFSC)

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